Rotary furnace



F. DEHNYEDEN.

ROTARY FURNACE.

APPLICATION FILED SEPT. 16, I919.

Patefilted M I O W 15' cidin-g with the axis of the apparatus UNITEDSTATES PATENT OFFICE.

rnmx nnnnnnniv, or QEABLEBOI, BELGIUM.

nounr ruanacn To all whom it may concern Be it known that I, FE IxDERNEDEN, a subject of the King of the Bel ians, residing at 122Boulevard Audent, (Jharle'roi, Belium, have invented certain new anduseful mprovements in Rotary Furnaces, of which the following is aspecification.

The lurgica particularly to a new method of constructing revolvingfurnaces. By revolving furnace is, generally understood apparatusrotating about an axis either horizontal or more or less inclined to thehorizon and coinitself,

such apparatus being utilized in indust for carrying out variousoperations suc as drying, roasting or calcining and various chemicalreactions, etc.

The arrangement of known rotary furnaces is varied according tothenature of the materials to be treated and the purpose of the treatmentunder consideration; Thus, for instance, in continuous working furnacesin which charging regularly takes place at one side and discharging atthe other, the passage of'the material throu h the apparatus itself iseffected sometimes y inclining the axis of rotation, sometimes byopening out the walls of the furnace, thatis to say, try adoptin theform of a truncated cone, or again by, orming helical rooves or slotsinthe front walls ofcylindrical form,

etc. In furnaces in, which the operation is effected under thev actionof heat, the constructional arrangements may be consider ably'variedaccordingrt o the nature and ref sults of this action he mostdifi'i'cult condition to fulfil however, is the prolongation 0f thelength of time the material isretained in the furnace, particularl foroperations that require a certain perio for their propermaterialization. In the furnaces as here'- tofore constructed the lengthof time the material to be treatedreniains in the furnace is prolongedby rotating the furnaces so slowly that the rotation is very difiicultto carry on, or by increasing to an excessive ex' p A of the apparatusor theoriginal cylinder" in tent the total lengthof the apparatus. 50.

of a prolonged rotation of the material in the revolving furnace bysubdividing the furnace into several tubes, and it multiplies in varyingproportions the effects of the sim- 65 9 mm Specification of LettersPatent.

resent invention relates to the metalindustry in general, and refersmore The present invention fulfils the condition dinal section, of afurnace for the roastin of blende, constructed; in accordance withv thisinvention. a l

Fi e 6 and 7 arecross sections ofFig. 5.- Re ferring to Fig. 1, a solidcylinder 1, is

. presumedto be rotating about the central axis in the direction of thearrow. In this Patented 'Mar. 22,1921. Application filed September 16,1919. Serial No.- 824,205. I

cylinder are formed four small cylindrical c annels, 1, 1 1 1, arrangedsymmetri cally about the central axis. Assuming that 1 this cylinderrevolves about .he'central axis in, the directionof the arrow, as soonasthe line 2-2 has moved a little way to the right of the vertical, anymaterial deposited in the cylindrical channel 1' will flow throu h theinner passage into the cylinder 1 is the revolving continues, thismaterial will have to pass, around the cylinder 1*, and itwill finishthis revolution when this cylinder has reached the position that waspreviously o'ccupied at'the start'by the cylinder 1, that is to say,after the completion of the revolution of the furnace as awhole. At thismoment the material will slip into the cylinder 1 the same movementswill be repeated for its stay in this cylinder, and then for its stay inthe cylinder 1. Assuming next that these cvlinders 1', 1, 1 and 1 areeach divided hroughout their length into equal compartments by means ofvertical partitions, and that the communicating passages are so arrangedthat the first compartment of 1' communicates with the first com artmentof 1 the latter with the'first of t e cylinder 1, and this latter withthe first of the cylinder 1*, which cylinderwould bein communicationwith the second compartment of the c lindfer 1. It would follow fromthis cons ruction that it is necessary for the whole which the foursmall cylinders are engaged, to make four complete revolutions beforethe material has advanced one compartment. The number of sub-divisionalchannels may be increased, (see Figs. 3 and 4:) and the passagescommunicating between the various cylinder may be made at the peripheryof the cylinder instead of being arrangedat t e center- -It is notnecessary in practice to, partitiqn;

'ofl? the sub-divisional cylinders 1',"1",etc2

' lhis imaginary partition is given by way of e 'xpl nation-$111practice the forward movement will proceedas iii the partitions existed;The progress or advancement of the materialwill beobtai'nedby'constructmg the aperture of the communication passage. between thesub-divisional cylinders 1 and 1" not along a generating linebut alongaline that diverges slightly toward the hack. This advancement may alsobe-obtained-zby inclining or curving toward ,the back the face ofthispassage,or the face 4 -4 of the cylinderl The amplitude of;thel'adyancement may also be varied by repeating on one or'more on 'onall the passages'bf the various sub divisional cylindersthe-.ide'vicesuggested for the first cylin'der lfl'i T'his-construction isin'practice ofgreat simplicity, and can be readily carried out inrefractory materials as required, for example, when. applying it to theroasting of ores. Moreover in the particular icases in whichjtheref isoccasion for providing for heating, a-diversity of special channels maybe formed in the blocks between :the cylinders, enabling the heating tobe carried out by means of a gas-producer, whichmay' even se'rvejfor'several'piec'esof apparatus at the same time, or by any other devicesuitable forthe object-in-view. 1 The furnace illustrated in'F-igs. 5 to7 comprises channels of this type. 5 designates the ehargerand 6 thedischarger; 1, 1

Fund 1" designate the working cylinders through which passes '1tliematerial to be treated; 7 the combustion channels,8 the inletfor thecombustible gases, 9 the returns w forthe flames, 10 the exit for thesmoke, and

11 the exit for the sulfurous gases.

Figs. 5, 6 and 7 are drawn as if the subdivisional cylinders, thechannels, etc., were whollowedwou-t'of the material of which a singlesolid cylinder 1 consists. In practice these various channels andpassages are ob- .tained by the juxtaposition of constructional--materials-w'hich for this purpose, have predeterminedand-suitableforms and dimenisions."

' .1. felt will bepunderstood that'this invention is applicable to anumber of industries and min various constructional forms, eachdiiierentindustrial application requiring an appropriate constructionalmodification. pllhatI claim and desire to secure by .Letters Patent ofthe United States is 1. A revolving furnace comprising a series ofchannels or'chambers arranged around 't'he-a:xis of rotation andconnected with one anotherby means of passages as and for the purposespecified.

A revolving furnace comprisim a series of channels or chambers arrangedaround the axis of rotation and connected with one another by means ofpassages having inclined faces, substantially as described for thepurpose specified. a 1

In testimony whereof I afiix my signature in presence of two witnesses.

FELIX DERNEDEN.

lVitnesses:

FELIX DE Cot-MAN, A. Josnrn Owens.

